To me, cessation of suffering means that you know which actions and choices will cause suffering, so you try to make choices that will not cause unnecessary suffering. It does not mean that you cannot suffer.
Cessation of suffering actually makes you free. Using your analogy, if you just float downstream, you will have no choice over your life. Once you are enlightened, you will be able to hover on top of the stream, and go anywhere you wish, up the stream, down the stream or leave the stream and go to the forest instead.
Hi Nathan, I offer another observation from my experience. I have found that the moments of peace which I experience from practice lead me to continue with practice with confidence of the outcome.